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Genetic, temporal and developmental differences
between melatonin rhythm generating systems in the teleost fish pineal
organ and retina.
Falcon J, Gothilf Y, Coon SL,
Boeuf G, Klein DC.
Laboratoire Arago, UMR 7628, CNRS and
University Pierre and Marie Curie, BP 44, F-66651 Banyuls sur Mer,
France. falcon@obs-banyuls.fr
Complete melatonin rhythm
generating systems, including photodetector, circadian clock and
melatonin synthesis machinery, are located within individual
photoreceptor cells in two sites in Teleost fish: the pineal organ and
retina. In both, light regulates daily variations in melatonin secretion
by controlling the activity of arylalkylamine N-acetyltransferase
(AANAT). However, in each species examined to date, marked differences
exist between the two organs which may involve the genes encoding the
photopigments, genes encoding AANAT, the times of day at which AANAT
activity and melatonin production peak and the developmental schedule.
We review the fish pineal and retinal melatonin rhythm generating
systems and consider the evolutional pressures and other factors which
led to these differences.
Publication Types:
PMID: 12622837 [PubMed - indexed for
MEDLINE]
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